Optical Smoke Alarm

1 Year Replaceable Battery

Our SB1-R optical smoke alarm is ideal for grade F2 installations where cost is a priority. Optical alarms are recommended in the British Standard BS 5839-6 for installation in circulation areas such as hallways and landings.

Optical Sensor

A fast response to slow burning fires.

3 Year Warranty

For peace of mind




Our datasheet and manual contain guidance on the product and the latest standards - if you have any additional questions, our team of experts can offer all the support you need, so get in touch!


Installation Support and Guidance


Specification Detail and Standards.




This alarm cannot be interlinked to other alarms in your home, but still offers a high protection against fire. Follow the installation guides to ensure your alarm is installed correctly and test weekly.

Testing Support

Testing and maintenance support.

Slow Burning Fire Protection Optical Smoke Sensing

The optical smoke sensing chamber works by 'seeing' smoke as it enters the alarm - making it perfect for slow burning fires where there is thick white smoke. For the fastest response to all fire types search for FireAngel Specification Multi-Sensor alarms.

Optical Smoke Sensing
Battery Powered Protection 1 Year Battery Included

The unit is provided with one 9V battery which will last around a year and can then be replaced. For long-life alarms look for FireAngel Specification, our 10 year life range with mains and sealed battery powered which will protect properties for 10 years.

1 Year Battery Included
Effective safety solutions Futureproof Installations

We are leading the way in fire safety with state of the art design and technology to deliver the most reliable and efficient home safety solutions. Our advanced, trusted technology has been fitted by UK Fire & Rescue Services since 2007 and delivers enhanced levels of safety for tenants and properties.

Futureproof Installations

Did you know?

Our Specification alarms interlink for enhanced protection Find out more

We’ve modernised the functionality of our range of Specification products to meet the demands of today’s Connected Home market. FireAngel Specification revolutionises the future of fire safety by offering smart wireless protection against fire and CO in a single cost-effective system that can be adapted to suit the needs of each and every property.

Find out more


No, the SB1-T is a standalone battery-powered optical smoke alarm with no interlink options. This unit cannot be interlinked with any other products – please see our FireAngel Specification range or our FireAngel Mains with 9V battery backup range, both of these ranges offer hardwire and wireless interlink options.

According to latest BS 5839-6 standards, for maximum LD1 protection you should fit a smoke alarm in the following rooms: Hallway, Landing, Living Room, Bedroom, Airing / Meter Cupboards, Loft, Garage. A smoke alarm is not recommended for installation in a kitchen, you should install a heat alarm in kitchens.

For further guidance on BS 5836-6, please visit our Standards and Regulations Section.

Whilst BS 5839-6 has previously been split into six varying Grades, each outlining the level of protection appropriate for certain properties and their corresponding levels of risk, the new update has altered the six sections, removing Grade B and Grade E, whilst Grade D and Grade F have been split into Grade D1 / Grade D2 and Grade F1 / Grade F2 respectively. Grade C has been revised and its recommendations expanded.

The 2019 grading system is as follows:

Grade A

Separate detectors, sounders and central control and indicating equipment with back-up power supply that conforms to British Standards BS EN 54.

Grade C

Separate detectors and sounders that are mains powered with back-up power supply and central control equipment.

Grade D1

A system of one or more mains powered detectors, each with a tamper‑proof standby supply consisting of a battery or batteries (such as FireAngel’s SM-SN-1 and HM-SN-1 alarm).

Grade D2

A system of one or more mains-powered detectors, each with an integral standby supply consisting of a user‑replaceable battery or batteries. (such as FireAngel’s SW1-PF-T and HW1-PF-T alarm).

Grade F1

A system of one or more battery-powered detectors powered by a tamper‑proof primary battery or batteries (such as FireAngel’s ST-622T, ST-750 alarm).

Grade F2

A system of one or more battery-powered detectors powered by a user‑replaceable primary battery or batteries. (such as FireAngel’s SB1-T alarm).
Please note: Grades B and E are no longer defined in BS 5839-6:2019.